Flue control device

Stoves and furnaces – Stovepipes

Patent

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Details

126297, 122155A, 138 46, F23J 1100

Patent

active

048503363

ABSTRACT:
A device for adjustably restricting the flow of exhaust gases in a furnace flue to conserve fuel is disclosed. It comprises two interlocking pipe sections and a helical element having one end fixed to the inner surface of each pipe section. The helical element has a circular opening along its central axis. The degree of restriction provided by the device is adjusted by twisting or separating the two pipe sections.

REFERENCES:
patent: 153082 (1874-07-01), Johnson
patent: 293893 (1884-02-01), Lindley et al.
patent: 335631 (1886-02-01), Root
patent: 432544 (1890-07-01), Moore
patent: 660761 (1900-10-01), Seyfarth
patent: 1120550 (1911-10-01), Schulz
patent: 1332746 (1920-03-01), Oberg
patent: 2020194 (1932-07-01), Kuhlmann
patent: 3052230 (1962-09-01), Conrad
patent: 4044796 (1977-08-01), Smick

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